package com.example.nfc.barcodescan.camera;

import android.content.Context;
import android.graphics.ImageFormat;
import android.graphics.Point;
import android.graphics.Rect;
import android.hardware.Camera;
import android.os.Handler;
import android.os.Message;
import android.util.Log;
import android.view.SurfaceHolder;

import com.example.nfc.barcodescan.android.CaptureActivityHandler;
import com.example.nfc.barcodescan.bean.ZxingConfig;
import com.example.nfc.barcodescan.common.Constant;
import com.example.nfc.server.utils.DisplayUtil;

import java.io.IOException;
import java.util.List;

/**
 * This object wraps the Camera service object and expects to be the only one
 * talking to it. The implementation encapsulates the steps needed to take
 * preview-sized images, which are used for both preview and decoding.
 *
 * @author dswitkin@google.com (Daniel Switkin)
 */
public final class CameraManager {

    private static final String TAG = CameraManager.class.getSimpleName();

    private static CameraManager cameraManager;

    private final Context context;
    private final CameraConfigurationManager configManager;
    private ZxingConfig config;
    private Camera camera;
    private AutoFocusManager autoFocusManager;
    private Rect framingRect;
    private Rect framingRectInPreview;
    private boolean initialized;
    private boolean previewing;
    private int requestedCameraId = -1;
    private int requestedFramingRectWidth;
    private int requestedFramingRectHeight;
    /**
     * Preview frames are delivered here, which we pass on to the registered
     * handler. Make sure to clear the handler so it will only receive one
     * message.
     */
    private final PreviewCallback previewCallback;

    public CameraManager(Context context, ZxingConfig config) {
        this.context = context;
        this.configManager = new CameraConfigurationManager(context);
        previewCallback = new PreviewCallback(configManager);
        this.config = config;
    }

    public Camera getCamera(){
        return camera;
    }

//    public static void init(Context context) {
//        if (cameraManager == null) {
//            cameraManager = new CameraManager(context, null);
//        }
//    }


    /**
     * Opens the camera driver and initializes the hardware parameters.
     *
     * @param holder The surface object which the camera will draw preview frames
     *               into.
     * @throws IOException Indicates the camera driver failed to open.
     */
    public synchronized void openDriver(SurfaceHolder holder)
            throws IOException {
        Camera theCamera = camera;

        if (theCamera == null) {

            if (requestedCameraId >= 0) {
                theCamera = OpenCameraInterface.open(requestedCameraId);
            } else {
                theCamera = OpenCameraInterface.open();
            }

            if (theCamera == null) {
                throw new IOException();
            }
            camera = theCamera;
        }
        theCamera.setPreviewDisplay(holder);


        if (!initialized) {
            initialized = true;
            configManager.initFromCameraParameters(theCamera);
            if (requestedFramingRectWidth > 0 && requestedFramingRectHeight > 0) {
                setManualFramingRect(requestedFramingRectWidth,
                        requestedFramingRectHeight);
                requestedFramingRectWidth = 0;
                requestedFramingRectHeight = 0;
            }
        }
        Camera.Parameters parameters = theCamera.getParameters();

       // NLog.e("sdfsdfgsdf",JsonMananger.beanToJsonStr(parameters));

        String parametersFlattened = parameters == null ? null : parameters
                .flatten(); // Save these, temporarily
        try {
            initConfig(parameters,theCamera);
        } catch (RuntimeException re) {
            // Driver failed
            Log.w(TAG,
                    "Camera rejected parameters. Setting only minimal safe-mode parameters");
            Log.i(TAG, "Resetting to saved camera params: "
                    + parametersFlattened);
            // Reset:
            if (parametersFlattened != null) {
                parameters = theCamera.getParameters();
                parameters.unflatten(parametersFlattened);
                try {
                    initConfig(parameters,theCamera);
                } catch (RuntimeException re2) {
                    // Well, darn. Give up
                    Log.w(TAG,
                            "Camera rejected even safe-mode parameters! No configuration");
                }
            }
        }

    }

    private int mPreviewWidth;
    private int mPreviewHeight;
    private float mPreviewScale;
    private void initConfig(Camera.Parameters parameters, Camera camera) {
        try {
            // 如果摄像头不支持这些参数都会出错的，所以设置的时候一定要判断是否支持
            List<String> supportedFlashModes = parameters.getSupportedFlashModes();
            if (supportedFlashModes != null && supportedFlashModes.contains(Camera.Parameters.FLASH_MODE_OFF)) {
                parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF); // 设置闪光模式（关闭）
            }
            List<String> supportedFocusModes = parameters.getSupportedFocusModes();
            if (supportedFocusModes != null && supportedFocusModes.contains(Camera.Parameters.FOCUS_MODE_AUTO)) {
                parameters.setFocusMode(Camera.Parameters.FOCUS_MODE_AUTO); // 设置聚焦模式（自动）
            }
            parameters.setPreviewFormat(ImageFormat.NV21); // 设置预览图片格式
            parameters.setPictureFormat(ImageFormat.JPEG); // 设置拍照图片格式
            parameters.setExposureCompensation(0); // 设置曝光强度
            Camera.Size previewSize = getSuitableSize(parameters.getSupportedPreviewSizes());
            mPreviewWidth = previewSize.width;
            mPreviewHeight = previewSize.height;

            //NLog.e("dfsdfgsdf",mPreviewWidth,mPreviewHeight);
            //mPreviewRatio = (float)mPreviewWidth/mPreviewHeight;

            mPreviewScale = mPreviewHeight * 0.5f / mPreviewWidth;

            parameters.setPreviewSize(mPreviewWidth, mPreviewHeight); // 设置预览图片大小
            Log.d("cameraview", "previewWidth: " + mPreviewWidth + ", previewHeight: " + mPreviewHeight);
            Camera.Size pictureSize = getSuitableSize(parameters.getSupportedPictureSizes());
            parameters.setPictureSize(pictureSize.width, pictureSize.height);
            //Log.d("cameraview", "pictureWidth: " + pictureSize.width + ", pictureHeight: " + pictureSize.height);
            camera.setParameters(parameters); // 将设置好的parameters添加到相机里
            camera.enableShutterSound(false);//关掉拍照声音
            configManager.setDesiredCameraParameters(camera);
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
    private Camera.Size getSuitableSize(List<Camera.Size> sizes) {
        int shortSide = 1080;
        int longSide = 1920;
        float aspectRatio = (float) longSide / shortSide;
        int index = 0; // 最小的差值对应的索引坐标
        for (int i = 0; i < sizes.size(); i++) {
            Camera.Size previewSize = sizes.get(i);
            Log.v("cameraview", "SupportedPreviewSize, width: " + previewSize.width + ", height: " + previewSize.height);
            // 找到一个与设置的分辨率差值最小的相机支持的分辨率大小
//            if(previewSize.width>1000&&previewSize.width<1920){
//                return previewSize;
//            }
            if ((float) previewSize.width / previewSize.height == aspectRatio && previewSize.height <= shortSide && previewSize.width <= longSide) {
                return previewSize;
            }
//            if (previewSize.width * mPreviewScale == previewSize.height) {
//                int delta = Math.abs(mPreviewWidth - previewSize.width);
//                if (delta == 0) {
//                    return previewSize;
//                }
//                if (minDelta > delta) {
//                    minDelta = delta;
//                    index = i;
//                }
//            }
        }
        return sizes.get(index); // 默认返回与设置的分辨率最接近的预览尺寸
    }

    public synchronized boolean isOpen() {
        return camera != null;
    }

    /**
     * Closes the camera driver if still in use.
     */
    public synchronized void closeDriver() {
        if (camera != null) {
            camera.release();
            camera = null;
            // Make sure to clear these each time we close the camera, so that
            // any scanning rect
            // requested by intent is forgotten.
            framingRect = null;
            framingRectInPreview = null;
        }
    }


    /*切换闪光灯*/
    public void switchFlashLight(CaptureActivityHandler handler) {
        //  Log.i("打开闪光灯", "openFlashLight");

        Camera.Parameters parameters = camera.getParameters();

        Message msg = new Message();

        String flashMode = parameters.getFlashMode();

        if (flashMode.equals(Camera.Parameters.FLASH_MODE_TORCH)) {
            /*关闭闪光灯*/
            parameters.setFlashMode(Camera.Parameters.FLASH_MODE_OFF);

            msg.what = Constant.FLASH_CLOSE;


        } else {
            /*打开闪光灯*/
            parameters.setFlashMode(Camera.Parameters.FLASH_MODE_TORCH);
            msg.what = Constant.FLASH_OPEN;
        }
        camera.setParameters(parameters);
        handler.sendMessage(msg);
    }


    /**
     * Asks the camera hardware to begin drawing preview frames to the screen.
     */
    public synchronized void startPreview() {
        Camera theCamera = camera;
        if (theCamera != null && !previewing) {
            theCamera.startPreview();
            previewing = true;
            autoFocusManager = new AutoFocusManager(camera);
        }
    }

    /**
     * Tells the camera to stop drawing preview frames.
     */
    public synchronized void stopPreview() {
        if (autoFocusManager != null) {
            autoFocusManager.stop();
            autoFocusManager = null;
        }
        if (camera != null && previewing) {
            camera.stopPreview();
            previewCallback.setHandler(null, 0);
            previewing = false;
        }
    }

    /**
     * A single preview frame will be returned to the handler supplied. The data
     * will arrive as byte[] in the message.obj field, with width and height
     * encoded as message.arg1 and message.arg2, respectively.
     *
     * @param handler The handler to send the message to.
     * @param message The what field of the message to be sent.
     */
    public synchronized void requestPreviewFrame(Handler handler, int message) {
        Camera theCamera = camera;
        if (theCamera != null && previewing) {
            previewCallback.setHandler(handler, message);
            theCamera.setOneShotPreviewCallback(previewCallback);
        }
    }


    /*取景框*/
    public synchronized Rect getFramingRect() {
        if (framingRect == null) {
            if (camera == null) {
                return null;
            }
            Point screenResolution = configManager.getScreenResolution();
            if (screenResolution == null) {
                // Called early, before init even finished
                return null;
            }

            int screenResolutionX = screenResolution.x;

            //扫描框宽度
            int width = (int) (screenResolutionX * 0.9);
            //扫描框高度
            //465 屏幕全部控件的累加高度
            int height =width;
            /*水平居中  偏上显示*/
            int leftOffset = (screenResolution.x - width) / 2;
            int topOffset =  DisplayUtil.dip2px(context,75);

            framingRect = new Rect(leftOffset, topOffset, leftOffset + width,
                    topOffset + height);
            Log.d(TAG, "Calculated framing rect: " + framingRect);
        }
        return framingRect;
    }


    /**
     * Like {@link #getFramingRect} but coordinates are in terms of the preview
     * frame, not UI / screen.
     *
     * @return {@link Rect} expressing barcode scan area in terms of the preview
     * size
     */
    public synchronized Rect getFramingRectInPreview() {
        if (framingRectInPreview == null) {
            Rect framingRect = getFramingRect();
            if (framingRect == null) {
                return null;
            }
            Rect rect = new Rect(framingRect);
            Point cameraResolution = configManager.getCameraResolution();
            Point screenResolution = configManager.getScreenResolution();
            if (cameraResolution == null || screenResolution == null) {
                // Called early, before init even finished
                return null;
            }

            /******************** 竖屏更改1(cameraResolution.x/y互换) ************************/
            rect.left = rect.left * cameraResolution.y / screenResolution.x;
            rect.right = rect.right * cameraResolution.y / screenResolution.x;
            rect.top = rect.top * cameraResolution.x / screenResolution.y;
            rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
            framingRectInPreview = rect;
        }
        return framingRectInPreview;
    }

    /**
     * Allows third party apps to specify the camera ID, rather than determine
     * it automatically based on available cameras and their orientation.
     *
     * @param cameraId camera ID of the camera to use. A negative value means
     *                 "no preference".
     */
    public synchronized void setManualCameraId(int cameraId) {
        requestedCameraId = cameraId;
    }

    /**
     * Allows third party apps to specify the scanning rectangle dimensions,
     * rather than determine them automatically based on screen resolution.
     *
     * @param width  The width in pixels to scan.
     * @param height The height in pixels to scan.
     */
    public synchronized void setManualFramingRect(int width, int height) {
        if (initialized) {
            Point screenResolution = configManager.getScreenResolution();
            if (width > screenResolution.x) {
                width = screenResolution.x;
            }
            if (height > screenResolution.y) {
                height = screenResolution.y;
            }
            int leftOffset = (screenResolution.x - width) / 2;
            int topOffset = (screenResolution.y - height) / 5;
            framingRect = new Rect(leftOffset, topOffset, leftOffset + width,
                    topOffset + height);
            Log.d(TAG, "Calculated manual framing rect: " + framingRect);
            framingRectInPreview = null;
        } else {
            requestedFramingRectWidth = width;
            requestedFramingRectHeight = height;
        }
    }



    public static CameraManager get() {
        return cameraManager;
    }
}
